3-51
D1
D2
D3
D4
D5
54
55
53
52
57
Fault code
(Hex)
Int. code
(Dec)
Meaning of the fault code
possible reason for fault detection
Reaction of the TCU
Possible steps to repair
Remarks
S.C. to battery voltage at power supply for
sensors
TCU measures more than 6V at the pin AU1
(5V sensor supply)
S.C. to ground at power supply for
sensors
TCU measures less than 4V at the pin AU1
(5V sensor supply)
Low voltage at battery
Measured voltage at power supply is lower
than 18V(24V device)
High voltage at battery
Measured voltage at power supply is higher
than 32.5V(24V device)
Error at valve power supply VPS1
TCU switched on VPS1 and measured
VPS1 is off or TCU switched off VPS1 and
measured VPS1 is still on
Cable or connectors are defect and are
contacted to battery voltage
Cable or connectors are defect and are
contacted to vehicle ground
Permanent power supply KL30 missing
TCU has an internal defect
See fault codes No.21 to 2C
See fault codes No.21 to 2C
Shift to neutral
OP mode : TCU shutdown
Shift to neutral
OP mode : TCU shutdown
Shift to neutral
OP mode : TCU shutdown
Check cables and connectors
to sensors, which are supplied
from AU1
Check the power supply at the
pin AU1(Should be appx. 5V)
Check cables and connectors
to sensors, which are supplied
from AU1
Check the power supply at the
pin AU1(Should be appx. 5V)
Check power supply battery
Check cables from batteries to
TCU
Check connectors from
batteries to TCU
Check power supply battery
Check cables from batteries to
TCU
Check connectors from
batteries to TCU
Check fuse
Check cables from gearbox to
TCU
Check connectors from
gearbox to TCU
Replace TCU
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Summary of Contents for HDF 50-7S
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